The mode of our breathing is closely related to our mental condition;

either influences the other
The mode of our breathing is closely related to our mental condition;
either influences the other. Agitation makes us catch our breath, and
sadness makes us sigh. Conversely, slow, even breathing calms mental
agitation. It is not without reason that, in the East, breathing
exercises are used as a means of cultivating mental poise and as an aid
to religious life.